On Jul 3, 2008, at 2:42 PM, Mark Zealey wrote:

Hi guys,

Anyone know what this error with deliver is (v1.1.1)?

2008-07-03T09:45:19+01:00 mail4 deliver(alexander): Panic: file mail-index-transaction.c: line 642 (mail_index_transaction_lookup): assertion failed: (seq >= t->first_new_seq && seq <= t->last_new_seq)

Could you get gdb backtrace from this? Although depending on your
configuration it might be tricky to get core dumps.. http://dovecot.org/bugreport.html has some ideas, but it doesn't really talk about deliver. I guess
the main things are:

• user should have a writable home directory (where the core is
  written to)
• run ulimit -c unlimited before running your MTA